Journal of Biomedical Science

, Volume 4, Issue 4, pp 162–168 | Cite as

Failure of neutralizing gp120 monoclonal antibodies to prevent HIV infection of choriocarcinoma-derived trophoblasts

  • Aldar S. Bourinbaiar
  • William Borkowsky
  • Keith M. Krasinski
  • Eric C. Fruhstorfer
Original Paper
Received:
Accepted:

Abstract

Although placental trophoblasts, the only fetal cells in direct contact with infectious maternal blood, can be infected with HIV, the precise cause for the low transmission rate of virus across the placental barrier is unknown. One of the most common conjectures is that maternal anti-HIV antibodies (Abs) contribute to the protection of the fetus. This hypothesis has been tested in vitro by infecting the CD4-negative placental trophoblast line, BeWo, with HIV-1IIIB in the presence of serial dilutions of neutralizing monoclonal Abs against the V3 loop (No. 694) or CD4-binding conformational domain (No. 588). The results, based on measurement of p24 production from virus-exposed cells, reveal that the titers of Abs, adequate in preventing the infection of control MT-4 T lymphocytes, were less effective in protecting trophoblasts. Furthermore, PCR analysis of HIV DNA formed after a single round of infection has shown no significant decrease in the number of viral copies in Ab-protected BeWo cells. An anti-HIV serum from a pregnant woman did also have no effect. Although our in vitro observations do not necessarily apply to the in vivo situation, the results suggest that the humoral immune response sustained by neutralizing Abs may be able to protect T lymphocytes, but not placental trophoblasts. The findings are consistent with recent clinical studies demonstrating a lack of correlation between the presence of neutralizing anti-HIV Abs in pregnant women and HIV transmission in utero.

Key Words

AIDS HIV-1 Humoral immunity Immunoglobulin Lymphocyte Mother-to-child transmission Placenta Pregnancy Trophoblast Vaccine 
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Copyright information

© National Science Council 1997

Authors and Affiliations

  • Aldar S. Bourinbaiar
    • 2
  • William Borkowsky
    • 1
  • Keith M. Krasinski
    • 1
  • Eric C. Fruhstorfer
    • 2
  1. 1.Department of Pediatrics, New YorkUniversity Medical CenterNew YorkUSA
  2. 2.Metatron, Inc.New YorkUSA

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